[PATCH v3 4/8] clk: qcom: cbf-msm8996: scale CBF clock according to the CPUfreq

[Dmitry Baryshkov <dmitry.baryshkov@linaro.org>]

Turn CBF into the interconnect provider. Scale CBF frequency (bandwidth)
according to CPU frequencies.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
 drivers/clk/qcom/clk-cbf-8996.c | 143 +++++++++++++++++++++++++++++++-
 1 file changed, 142 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/clk-cbf-8996.c b/drivers/clk/qcom/clk-cbf-8996.c
index 9cde0e660228..b049b4f7b270 100644
--- a/drivers/clk/qcom/clk-cbf-8996.c
+++ b/drivers/clk/qcom/clk-cbf-8996.c
@@ -5,11 +5,14 @@
 #include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
+#include <linux/interconnect-provider.h>
 #include <linux/of.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 
+#include <dt-bindings/interconnect/qcom,msm8996-cbf.h>
+
 #include "clk-alpha-pll.h"
 #include "clk-regmap.h"
 
@@ -225,6 +228,133 @@ static const struct regmap_config cbf_msm8996_regmap_config = {
 	.val_format_endian	= REGMAP_ENDIAN_LITTLE,
 };
 
+#ifdef CONFIG_INTERCONNECT
+struct qcom_msm8996_cbf_icc_provider {
+	struct icc_provider provider;
+	struct clk *clk;
+};
+
+#define to_qcom_cbf_provider(_provider) \
+	container_of(_provider, struct qcom_msm8996_cbf_icc_provider, provider)
+
+enum {
+	CBF_MASTER_NODE = 2000,
+	CBF_SLAVE_NODE
+};
+
+#define CBF_NUM_NODES 2
+
+static int qcom_msm8996_cbf_set(struct icc_node *src, struct icc_node *dst)
+{
+	struct qcom_msm8996_cbf_icc_provider *qp;
+
+	qp = to_qcom_cbf_provider(src->provider);
+
+	return clk_set_rate(qp->clk, icc_units_to_bps(dst->peak_bw));
+}
+
+static int qcom_msm8996_cbf_icc_get_bw(struct icc_node *node, u32 *avg, u32 *peak)
+{
+	struct qcom_msm8996_cbf_icc_provider *qp;
+
+	qp = to_qcom_cbf_provider(node->provider);
+	*peak = clk_get_rate(qp->clk) / 1000ULL;
+
+	return 0;
+}
+
+static int qcom_msm8996_cbf_icc_register(struct platform_device *pdev, struct clk_hw *cbf_hw)
+{
+	struct device *dev = &pdev->dev;
+	struct qcom_msm8996_cbf_icc_provider *qp;
+	struct icc_provider *provider;
+	struct icc_onecell_data *data;
+	struct icc_node *node;
+	struct clk *clk;
+	int ret;
+
+	clk = devm_clk_hw_get_clk(dev, cbf_hw, "cbf");
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
+	data = devm_kzalloc(dev, struct_size(data, nodes, CBF_NUM_NODES), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->num_nodes = CBF_NUM_NODES;
+
+	qp = devm_kzalloc(dev, sizeof(*qp), GFP_KERNEL);
+	if (!qp)
+		return -ENOMEM;
+
+	qp->clk = clk;
+
+	provider = &qp->provider;
+	provider->dev = dev;
+	provider->get_bw = qcom_msm8996_cbf_icc_get_bw;
+	provider->set = qcom_msm8996_cbf_set;
+	provider->aggregate = icc_std_aggregate;
+	provider->xlate = of_icc_xlate_onecell;
+	INIT_LIST_HEAD(&provider->nodes);
+	provider->data = data;
+
+	ret = icc_provider_add(provider);
+	if (ret) {
+		dev_err(dev, "error adding interconnect provider\n");
+		return ret;
+	}
+
+	node = icc_node_create(CBF_MASTER_NODE);
+	if (IS_ERR(node)) {
+		ret = PTR_ERR(node);
+		goto err;
+	}
+
+	node->name = "cbf_master";
+	icc_node_add(node, provider);
+	icc_link_create(node, CBF_SLAVE_NODE);
+	data->nodes[MASTER_CBF_M4M] = node;
+
+	node = icc_node_create(CBF_SLAVE_NODE);
+	if (IS_ERR(node)) {
+		ret = PTR_ERR(node);
+		goto err;
+	}
+
+	node->name = "cbf_slave";
+	icc_node_add(node, provider);
+	data->nodes[SLAVE_CBF_M4M] = node;
+
+	platform_set_drvdata(pdev, provider);
+
+	return 0;
+
+err:
+	icc_nodes_remove(provider);
+	icc_provider_del(provider);
+
+	return ret;
+}
+
+static int qcom_msm8996_cbf_icc_remove(struct platform_device *pdev)
+{
+	struct icc_provider *provider = platform_get_drvdata(pdev);
+
+	icc_nodes_remove(provider);
+	icc_provider_del(provider);
+
+	return 0;
+}
+#else
+static int qcom_msm8996_cbf_icc_register(struct platform_device *pdev)
+{
+	dev_warn(&pdev->dev, "interconnects support is disabled, CBF clock is fixed\n");
+
+	return 0;
+}
+#define qcom_msm8996_cbf_icc_remove(pdev) (0)
+#endif
+
 static int qcom_msm8996_cbf_probe(struct platform_device *pdev)
 {
 	void __iomem *base;
@@ -283,7 +413,16 @@ static int qcom_msm8996_cbf_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &cbf_mux.clkr.hw);
+	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &cbf_mux.clkr.hw);
+	if (ret)
+		return ret;
+
+	return qcom_msm8996_cbf_icc_register(pdev, &cbf_mux.clkr.hw);
+}
+
+static int qcom_msm8996_cbf_remove(struct platform_device *pdev)
+{
+	return qcom_msm8996_cbf_icc_remove(pdev);
 }
 
 static const struct of_device_id qcom_msm8996_cbf_match_table[] = {
@@ -294,9 +433,11 @@ MODULE_DEVICE_TABLE(of, qcom_msm8996_cbf_match_table);
 
 static struct platform_driver qcom_msm8996_cbf_driver = {
 	.probe = qcom_msm8996_cbf_probe,
+	.remove = qcom_msm8996_cbf_remove,
 	.driver = {
 		.name = "qcom-msm8996-cbf",
 		.of_match_table = qcom_msm8996_cbf_match_table,
+		.sync_state = icc_sync_state,
 	},
 };
 
-- 
2.39.0